package main

import (
	"context"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/widget"

	"completed/internal/client"
	"completed/internal/model"
)

// guiApp holds the window and the single client all screens share. It's a
// small base: log in, see your games in a table, refresh. Adding/editing
// games is for a later pass.
type guiApp struct {
	client *client.Client
	window fyne.Window
}

func newGUIApp(c *client.Client, w fyne.Window) *guiApp {
	return &guiApp{client: c, window: w}
}

// showLogin builds and displays the login form. It's the window's initial
// content.
func (a *guiApp) showLogin() {
	email := widget.NewEntry()
	email.SetPlaceHolder("email")
	password := widget.NewPasswordEntry()
	password.SetPlaceHolder("password")
	status := widget.NewLabel("")

	form := widget.NewForm(
		widget.NewFormItem("Email", email),
		widget.NewFormItem("Password", password),
	)
	form.SubmitText = "Log in"
	form.OnSubmit = func() {
		if err := validateLogin(email.Text, password.Text); err != nil {
			status.SetText(err.Error())
			return
		}
		status.SetText("Logging in...")
		a.login(email.Text, password.Text, status)
	}

	a.window.SetContent(container.NewVBox(
		widget.NewLabelWithStyle("Completed", fyne.TextAlignCenter, fyne.TextStyle{Bold: true}),
		form,
		status,
	))
}

// login runs the login request off the UI goroutine, then either shows the
// games screen or reports the error back on the login form - both via
// fyne.Do, since Fyne widgets may only be touched from the UI goroutine.
func (a *guiApp) login(email, password string, status *widget.Label) {
	go func() {
		_, err := a.client.Login(context.Background(), email, password)
		if err != nil {
			fyne.Do(func() { status.SetText(err.Error()) })
			return
		}
		fyne.Do(a.showGames)
	}()
}

// showGames displays the games table and fetches the current list.
func (a *guiApp) showGames() {
	var games []model.Game

	table := widget.NewTable(
		func() (int, int) { return gameTableSize(games) },
		func() fyne.CanvasObject { return widget.NewLabel("") },
		func(id widget.TableCellID, obj fyne.CanvasObject) {
			obj.(*widget.Label).SetText(gameCellText(games, id.Row, id.Col))
		},
	)
	for i := range gameColumns {
		table.SetColumnWidth(i, 120)
	}

	status := widget.NewLabel("Loading...")
	refresh := widget.NewButton("Refresh", func() {
		a.fetchGames(table, &games, status)
	})

	a.window.SetContent(container.NewBorder(
		container.NewVBox(
			widget.NewLabelWithStyle("Completed", fyne.TextAlignCenter, fyne.TextStyle{Bold: true}),
			container.NewHBox(refresh, status),
		),
		nil, nil, nil,
		table,
	))

	a.fetchGames(table, &games, status)
}

func (a *guiApp) fetchGames(table *widget.Table, games *[]model.Game, status *widget.Label) {
	go func() {
		result, err := a.client.ListGames(context.Background())
		fyne.Do(func() {
			if err != nil {
				status.SetText("Error: " + err.Error())
				dialog.ShowError(err, a.window)
				return
			}
			*games = result
			status.SetText("")
			table.Refresh()
		})
	}()
}